From nmacdonald@mindspring.com Wed Sep 27 17:38:58 1995 Path: ashpoly!cascade!bigsur!mindspring!nmacdonald From: nmacdonald@mindspring.com (Nadine MacDonald) Newsgroups: comp.sys.m68k Subject: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Sep27.173858.6997@mindspring.com> Date: Wed, 27 Sep 1995 17:38:58 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining. A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions. By passing the -mc68882 compiler flag in Think C, all sin/cos and sqrt operations compile directly to FPU opcodes. Make sure you install the 32-bit Enabler on older IIci machines running System 7.1! -- Nadine MacDonald | nmacdonald@mindspring.com PGP Key fingerprint: CF06 FE5B D27F 7B38 "Keep the channels open." From imacdonald@illinois.edu Fri Sep 29 05:55:58 1995 Path: ashpoly!cascade!transat!ukc!fennimore!illinois!imacdonald From: imacdonald@illinois.edu (Ines MacDonald) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Sep29.055558.7397@illinois.edu> Date: Fri, 29 Sep 1995 05:55:58 GMT References: <1995Sep27.173858.6997@mindspring.com> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Sep27.173858.6997@mindspring.com>, nmacdonald@mindspring.com (Nadine MacDonald) writes: > Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining. > A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions. Mac users bragging about 6-minute render times while Unix workstations do it in 20 seconds. Classic Apple distortion field. -- Ines MacDonald *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0